42 results about "State predictor" patented technology

A control system and method selects a switch configuration for a power circuit having N binary switches, based in part on a finite state machine. The control system includes an embedded simulator, and present and next state contemplators. The various switch states of the power circuit are modeled by the finite state machine such that at any time, the power circuit switches are in a Present State and there are a plurality of Next States which are one or more switch transitions away from the Present State. The embedded simulator estimates the operating conditions of the load based on measured operational characteristics and the Present State. The present state contemplator determines, based on the operating conditions, whether a switch state transition should be contemplated. If so, the next state contemplator determines the optimal next state based on performance criteria and sends a state switch command to the power circuit.

There are provided a control device, a control method, a control unit, and an engine control unit, which are capable of controlling a controlled object with relatively large phase delay and dead time, while attaining elimination of lag in control timing between the input and output of the controlled object and improvement of control accuracy at the same time. A state predictor calculates a deviation (output deviation) between an output from an oxygen concentration sensor and a predetermined target value at a predetermined deviation calculation period. Then, a DSM controller calculates a target air-fuel ratio for converging the output from the oxygen concentration sensor to the predetermined target value, according to the calculated deviation, based on any one of a Δ modulation algorithm, a ΔΣ modulation algorithm, and a ΣΔ modulation algorithm at a predetermined calculation period shorter than the predetermined deviation calculation period.

A hard disk drive with a circuit that provides a control signal to a voice coil motor to move a head across a disk. The disk drive includes a circuit that provides a control signal to the voice coil motor to move the head. The circuit also has a state predictor and an inversion filter that compute a vibration estimate used to detect a vibration in the drive. When a threshold vibration is detected a vibration estimate is combined with the control signal to compensate for the vibration. The circuit detects the vibration without the need for an accelerometer or other sensor.

A code-enhanced, multi-user detection, Reduced Algorithm Receiver in a multiuser communication system reduces the signal processing requirements by limiting the number of searches between consecutive symbol cycles using information from an encoder state diagram. The Receiver makes use of a convolutional encoder's state machine properties to mark possible transitions as invalid based on the current state of the multiple users'encoders, thus removing them from the search tree. The Reduced Algorithm Receiver comprises a Signal Sampler for converting a single composite waveform signal (Rx) to digitized composite signal (DRx), a Parameter Estimator for determining waveform characteristics of each of the multiple users, a Memory for storing predetermined training sequences for each of the users, a Next State Predictor that reduces the amount of symbols being checked during a current cycle, a Waveform Approximator that receives the user waveform characteristics data and a set of possible bits from the next state predictor and attempts to simulate modulation of the individual user signal, a Demodulator for comparing the set of possible composite waveforms (˜Tx) from the Waveforms Approximator to the digitized composite waveforms (DRx) and determining the best match waveform, and a Convolutional Decoder for receiving the best match symbols and decoding them for each of the users.

The present invention provides a controller for controlling a modeled plant robustly against disturbance. The controller comprises an estimator and a control unit. The estimator estimates disturbance applied to the plant. The control unit determines an input to the plant so that an output of the plant converges to a desired value. The input to the plant is determined to include a value obtained by multiplying the estimated disturbance by a predetermined gain. Since estimated disturbance is reflected in the input to the plant, control having robustness against disturbance is implemented. The controller may comprise a state predictor. The state predictor predicts the output of the plant based on the estimated disturbance and dead time included in the plant. The control unit determined the input to the plant so that the predicted output converges to a desired value. Since the state predictor allows for the dead time, the accuracy of the control is improved. The estimated disturbance is reflected in the predicted output, an error between the predicted output and an actual output of the plant is removed.

The invention discloses an anti-saturation PID (Proportion Integration Differentiation) control method for a motor speed regulation system. An integral predictor is added into a common PID controller; when an executor is saturated, the integral state predictor utilizes an error e of a control command value and a system output value, a differential value of the error and a limiter output value together to calculate a stable-state integral state value; and after the stable-state integral state value is processed by a low pass filter, integral items are reset. The method can be used for effectively inhibiting the integral saturation phenomenon, so that the controller can obtain smaller overshooting and shorter desaturation time in the case of saturation. The anti-saturation PID control method can be applied to the PID controllers of various motor speed regulation systems.

The invention discloses a state predictor-containing control method for consistency of virtual synchronous generators. The control method comprises the steps of determining a first output difference value <delta>yi according to the output power Pi and the rated power Pi<*> of the i virtual synchronous generator (VSG); determining a second output difference value <delta>Yi according to the first output difference value <delta>yi and a droop characteristic curve translation amount Yi of the i VSG, wherein the droop characteristic curve translation amount Yi is regulated by the second output difference value <delta>Yi and a consistency control parameter Qi; determining an output angular frequency <delta> <omega>i according to the second output difference value, a damping coefficient D<p, i> of the i VSG, the rated angular frequency <omega>b, an actually measured angular frequency <omega>i, and a virtual rotation inertia Ji; and determining an angle <theta>i according to the actually measured angular frequency <omega>i, and influencing the output power Pi and the consistency convergence speed according to the angle <theta>i. According to the state predictor-containing control method for the consistency of the virtual synchronous generators, the droop characteristic curve translation amount Yi is regulated by the second output difference value <delta>Yi and the consistency control parameter Qi, so that the convergence speed can be accelerated and the convergence value can be achieved rapidly.